.page-about {
  --about-sec: clamp(52px, 7.5vw, 116px);
  --about-gap: clamp(20px, 3.2vw, 44px);
  position: relative;
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 4.4vw, 46px);
  font-weight: 400;
  line-height: 1.16;
  letter-spacing: 0.01em;
  color: var(--mist-100);
  margin: 10px 0 18px;
}

.page-about .about-p {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: rgba(233, 245, 248, 0.76);
  margin: 0 0 16px;
}

.page-about .eyebrow {
  color: var(--steel-400);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  border-bottom: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .about-hero .breadcrumb {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel-400);
}

.page-about .about-hero .breadcrumb a {
  color: var(--steel-400);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--cyan-200);
}

.page-about .about-hero .breadcrumb [aria-current="page"] {
  color: var(--cyan-200);
}

.page-about .about-hero__inner {
  padding: clamp(24px, 4vw, 48px) 0 clamp(28px, 4vw, 52px);
  max-width: 1080px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(40px, 9vw, 92px);
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: 0.005em;
  color: var(--mist-100);
  margin: 14px 0 0;
}

.page-about .about-hero__title span {
  font-weight: 700;
  color: var(--cyan-400);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  margin: 24px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(233, 245, 248, 0.78);
}

.page-about .about-hero__meta {
  list-style: none;
  margin: clamp(26px, 3.6vw, 46px) 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.page-about .about-hero__meta-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 34px);
  font-variant-numeric: tabular-nums;
  color: var(--cyan-200);
  line-height: 1.1;
}

.page-about .about-hero__meta-label {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--steel-400);
}

.page-about .about-hero__media {
  margin: 0;
  position: relative;
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.02);
}

/* ---------- 缘起 ---------- */
.page-about .about-origin {
  padding: var(--about-sec) 0;
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-origin__aside {
  border-top: 1px solid var(--line);
  padding-top: 18px;
}

.page-about .about-origin__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
}

.page-about .about-origin__list li {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-origin__k {
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--cyan-400);
}

.page-about .about-origin__v {
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(233, 245, 248, 0.66);
}

/* ---------- 站点更新 ---------- */
.page-about .about-update {
  padding: var(--about-sec) 0;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(51, 230, 209, 0.08), transparent 62%),
    linear-gradient(180deg, rgba(11, 43, 71, 0.34), transparent 70%);
}

.page-about .about-update__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-update__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-update__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-update__list li {
  position: relative;
  padding: 18px 0 18px 46px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-update__list li:first-child {
  border-top: 1px solid var(--line-soft);
}

.page-about .about-update__num {
  position: absolute;
  left: 0;
  top: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lava-500);
}

.page-about .about-update__list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--mist-100);
}

.page-about .about-update__list p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(233, 245, 248, 0.7);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  padding: var(--about-sec) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-team__media .media__label {
  display: block;
  padding: 10px 14px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--steel-400);
  border-top: 1px solid var(--line);
}

.page-about .about-tabs {
  margin-top: 26px;
}

.page-about .about-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-tabs .tabs__tab {
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  padding: 11px 20px;
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--steel-400);
  cursor: pointer;
  transition: color 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-tabs .tabs__tab:hover {
  color: var(--cyan-200);
}

.page-about .about-tabs .tabs__tab[aria-selected="true"] {
  color: var(--cyan-400);
  border-color: var(--line);
  background: rgba(51, 230, 209, 0.06);
}

.page-about .about-tabs__panel {
  padding: 22px 0 0;
  border-top: 1px solid transparent;
}

.page-about .about-tabs__fig {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 48px);
  font-variant-numeric: tabular-nums;
  color: var(--cyan-400);
  line-height: 1;
}

/* ---------- 合作 ---------- */
.page-about .about-partner {
  padding: var(--about-sec) 0;
  border-top: 1px solid var(--line);
  background:
    radial-gradient(90% 70% at 10% 100%, rgba(255, 107, 53, 0.07), transparent 60%);
}

.page-about .about-partner__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-partner__media {
  margin: 0;
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-partner__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-net {
  display: block;
  width: 100%;
  max-width: 420px;
  height: auto;
  margin: 8px 0 22px;
  overflow: visible;
}

.page-about .about-net line {
  stroke: var(--line-strong);
  stroke-width: 1;
}

.page-about .about-net .net-node circle {
  fill: var(--trench-800);
  stroke: var(--cyan-400);
  stroke-width: 1.5;
  transition: fill 180ms var(--ease), stroke 180ms var(--ease), r 180ms var(--ease);
}

.page-about .about-net .net-node:hover circle {
  fill: var(--lava-500);
  stroke: var(--lava-500);
  r: 9;
}

.page-about .about-net .net-label {
  fill: var(--cyan-200);
  font-family: var(--font-body);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-anchor: middle;
  opacity: 0;
  transition: opacity 180ms var(--ease);
  pointer-events: none;
}

.page-about .about-net .net-node:hover .net-label {
  opacity: 1;
}

.page-about .about-net .net-core circle {
  fill: rgba(51, 230, 209, 0.14);
  stroke: var(--cyan-400);
  stroke-width: 1;
}

.page-about .about-net .net-core text {
  fill: var(--cyan-200);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-anchor: middle;
}

.page-about .about-partner__rules {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-partner__rules li {
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  line-height: 1.75;
  color: rgba(233, 245, 248, 0.68);
}

.page-about .about-partner__k {
  display: block;
  margin-bottom: 3px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-400);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  padding: var(--about-sec) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__head {
  margin-bottom: 20px;
}

.page-about .about-timeline__index {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 0 18px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline__index a {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--steel-400);
  text-decoration: none;
  padding: 5px 12px;
  border: 1px solid var(--line);
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .about-timeline__index a:hover,
.page-about .about-timeline__index a:focus-visible {
  color: var(--abyss-950);
  background: var(--cyan-400);
  border-color: var(--cyan-400);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--line);
  margin-left: 6px;
}

.page-about .about-timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 26px 0 26px 24px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 34px;
  width: 9px;
  height: 9px;
  background: var(--trench-800);
  border: 1px solid var(--cyan-400);
  transform: rotate(45deg);
  transition: background 180ms var(--ease), border-color 180ms var(--ease);
}

.page-about .about-timeline__item:hover::before {
  background: var(--lava-500);
  border-color: var(--lava-500);
}

.page-about .about-timeline__year span {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(52px, 12vw, 116px);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(180deg, var(--cyan-200), rgba(51, 230, 209, 0.16));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-timeline__body h3 {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--mist-100);
}

.page-about .about-timeline__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(233, 245, 248, 0.7);
  max-width: 64ch;
}

.page-about .about-timeline .index-tag {
  color: var(--steel-400);
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  padding: var(--about-sec) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: end;
  padding: clamp(22px, 3.4vw, 40px);
  border: 1px solid var(--line);
  background:
    linear-gradient(120deg, rgba(51, 230, 209, 0.1), rgba(11, 43, 71, 0.5) 55%, rgba(255, 107, 53, 0.08));
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta .about-p {
  max-width: 56ch;
  margin-bottom: 0;
}

/* ---------- 桌面 ---------- */
@media (min-width: 860px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 0.9fr);
    gap: clamp(32px, 5vw, 80px);
  }

  .page-about .about-origin__aside {
    border-top: 1px solid var(--line-strong);
    padding-top: 22px;
  }

  .page-about .about-update__grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: clamp(32px, 5vw, 78px);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: clamp(32px, 4.6vw, 68px);
  }

  .page-about .about-partner__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(32px, 4.6vw, 68px);
  }

  .page-about .about-timeline__item {
    grid-template-columns: minmax(150px, 220px) minmax(0, 1fr);
    align-items: start;
    gap: clamp(20px, 3.4vw, 56px);
    padding: 34px 0 34px 30px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 40px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero__inner {
    padding-bottom: clamp(38px, 3vw, 64px);
  }

  .page-about .about-timeline__year span {
    font-size: clamp(80px, 8vw, 132px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-net .net-node circle,
  .page-about .about-net .net-label,
  .page-about .about-timeline__item::before,
  .page-about .about-tabs .tabs__tab {
    transition: none;
  }
}
<<<END>>>